DESIS and PRISMA spectral library of agricultural crops in California's Central Valley in the 2021 Growing Season

Here we provide Germany’s Deutsches Zentrum fu¨r Luft- und Raumfahrt (DLR) Earth Sensing Imaging Spectrometer (DESIS) and Italy’s ASI’s PRecursore IperSpettrale della Missione Applicativa (PRISMA) Derived Spectral Library of Agricultural Crops for California. It was developed using DESIS and PRISMA hyperspectral data acquired in August 2021 near Fresno, CA. The 4-bin DESIS image has 60 bands with approximately 10 nm bandwidths from 400 to 1000 nm and is available through the German Aerospace Center and Teledyne Brown (2022). The PRISMA image has 235 bands with 10-12 nm bandwidths from 400-2500 nm and is available through the Italian Space Agency (ASI) (2022). In these PRISMA data, two bands in the overlapping spectral region of the visible-near infrared sensor and the shortwave infrared sensor were removed, for a total of 233 bands. Both images were downloaded as surface reflectance products. Some DESIS bands contain negative values; the user can choose to discard these bands. The crop type data and confidence layer for the year 2021 can be accessed through the USDA National Agricultural Statistics Service (2022). The DESIS and PRISMA Derived Spectral Library of Agricultural Crops dataset characteristics are described below, with DESIS and PRISMA data provided in two separate CSV files. Each dataset contains information for 16,581 samples located where the two images overlap. The user should examine the data against the USDA NASS CDL 2021 layer and decide whether some samples should be discarded due to uncertainty in the crop class label.

本数据集提供德国航空航天中心（Deutsches Zentrum für Luft- und Raumfahrt, DLR）地球传感成像光谱仪（DESIS）与意大利航天局（ASI）应用任务型高光谱卫星（PRISMA）的加利福尼亚州农作物衍生光谱库。该数据集基于2021年8月在加利福尼亚州弗雷斯诺附近获取的DESIS与PRISMA高光谱数据构建。4波段组的DESIS影像包含60个波段，波段带宽约10 nm，覆盖波长范围400~1000 nm，可通过德国航空航天中心与Teledyne Brown（2022）获取。PRISMA影像包含235个波段，波段带宽10~12 nm，覆盖波长范围400~2500 nm，可通过意大利航天局（ASI，2022）获取。需注意，在PRISMA数据中，可见光-近红外传感器与短波红外传感器重叠光谱区内的2个波段已被移除，最终有效波段数为233个。所有影像均以地表反射率产品形式下载。部分DESIS波段存在负值，用户可选择移除这些波段。2021年的作物类型数据与置信度图层可通过美国农业部国家农业统计服务局（USDA NASS，2022）获取。本DESIS与PRISMA农作物衍生光谱库的数据集特征如下：DESIS与PRISMA数据分别存储于两个独立的CSV文件中，每个数据集均包含16581个位于两幅影像重叠区域内的样本。用户需对照美国农业部NASS 2021年作物数据图层（CDL 2021）对数据进行核查，并可根据作物类别标签的不确定性移除部分样本。